Question about 1994 Chrysler Town & Country

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'94 T&C 3.8L Won't Start

I have been told the CM is in "Security-Fuel OFF" mode. I have NO codes but have a flashing dot on the digital dash just above the odometer reading. Engine cranks, no spark, no fuel pump (but I can manually close the Fuel Relay and it runs). Checked ASD relay-OK, exchanged fuel & ASD relays-no help, replaced crankshaft sensor-no help, replaced camshaft sensor-no help, checked coil-OK, checked battery & ignition power to ECM-OK. I have been told that if is model gets into "Security Mode" the only way is to replace ECM. Is that true?? What condition puts the ECM into "Security Mode"?

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  • Donald Braun Sep 01, 2008

    I made this original post while troubleshooting. Now I finally have it fixed. After checking that fuel pump was-OK, fuel pressure-OK, all fuses-OK, all relays-OK, I replaced (in order) 1) the Crankshaft sensor-still no start, 2) the Camshaft sensor-still no start, 3) the ECM computer with an overhauled ECM from Auto-Comp (Houston, TX) for $175.00. The engine started (yeah!!) but extremely rough idle, back fire, could not accelerate. The "flashing dot" on my digital display was gone. Repeated all tests above to troubleshoot this NEW problem.



    During all of this troubleshooting was I getting NO codes (except 12 & 55). I took the computer back to vendor, they exchanged it for no cost (only once). The Tech at computer vendor said possibly the coil/distributor is bad. This vehicle has solid state coil block. I replaced coil-still extremely rough idle.



    I replaced throttle position sensor-still extremely rough idle. Tested Manifold Absolute Pressure sensor per an article I found on Tech Tips. MAP checked good. Removed & inspected crankshaft sensor. Paper spaced still intact. Re-installed, making sure it was all the way in with paper touching flywheel-still extremely rough idle. Removed & inspected camshaft sensor. Paper spaced still intact. Re-installed, making sure it was all the way in with paper touching camshaft pulley. YaaaaHooooo!!! That fixed it. I guess when I originally installed the camshaft sensor I did not get it close enough to the camshaft pulley. Wow!! What a troubleshooting challenge.



    My original problem (no start) was fixed by replacing the computer, but the extremely rough idle was corrected by installing the cam sensor with the paper "touching" the pulley.

  • Anonymous Sep 13, 2008

    Exactly the same problem, i have not replace the cam and crankshaft sensors yet. Just got replacement ecm from some company in california, looked like they just pulled one from a junkyard and sent it to me. I did not know what the blinking light above the odometer was. how do i get it turned off.??

  • Anonymous Dec 15, 2008

    no spark,it would start and run for 3 or 4 minutes then shutoff,an hour or two later it would do the same thing.Replaced the crankshaft sensor coil plugs and wires,now it doesnt start at all!!...no spark,gets fuel.

    ???

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4 Suggested Answers

  • 1206 Answers

SOURCE: Car won't start. There is no spark at the plugs. I

check your fuses if they are all good ,check all the ground wires on the engine make sure they are all making good connections,and if still not starting then its a very good chance that your PCM (computer) is bad. you can buy a used one for little money at a salvage yard.

Posted on Jan 29, 2010

Testimonial: "Engine ground was broke!"

richard3707
  • 70 Answers

SOURCE: my van 1999 dodge is showing p1389 trouble code (no ASD relay

Replace the ASD relay,but first check the relays powers.One power feed battery and the other one is key on.

Posted on Apr 18, 2010

jturcotte
  • 6811 Answers

SOURCE: if the camshaft and crankshafts

Hi, the marks must stay aligned. If the gears are moving when you apply the tensioner, you will have to account for that by backing them up before releasing the tensioner. OR Make sure the belt is tight between the gears with the marks aligned, then release the tensioner. Rotate the engine 2 revs after adjusting the tension to make sure gears hit all marks again. You must have this right before closing the engine cover.

Posted on May 16, 2011

afarri
  • 1386 Answers

SOURCE: 2001 Town & Country. No spark. Have codes

Hello and welcome to FixYa!
As a first course of action, I strongly suggest that you remove the positive battery connector and let it sit for atleast 5mins. before reconnecting. This will reset the system and may get it back to it's normal operation.
If the problem still persists, don't lose hope. If you happen to know someone who has a spare ECM then try a swap for I'm suspecting a computer issue here. If there's none, you may want to get one from the junkyard to cut the cost.
Hope this helps and thank you for using FixYa! Have a good one!

Posted on Jul 24, 2011

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